A demografics decline, sure.
But technically the west remains on top, only challenged by China (the same China facing a demografics fall... And so far China is mainly able to copy and paste west tech).
It will be as in South Africa : the economic power remains in few hands, and not in the numerous ones.
It continues to amaze me how people who used to be top dogs, convinced themselves that they will continue to be player who counts...while in decline and in visible decline.
The Arab caliph of Baghdad boasts that they will continue to rule the earth until the end of times.
The justifications ? Because we are :
1. The military and economic juggernaut of the era
2. Our superior intellect
The thing is, ALL soon to collapse civilizations in the past, their intellectual phase are always AFTER their political decline. Which then soon be exploited by a new class of conquering race, which mostly are backwards and illiterate
So yes, it make sense, the political and military superiority of the White race has been on a steady decline since their high point during the time of ' Belle Epoch" or the great beauty in the 1900s then after that WW1, WW1, Viet Nam, the war in the Middle East has steadily eroded the comparative superiority of the West compared to the rest of the world.
We are now in a cycle where group like Houthis are able to stop naval commerce in the Red Sea and the West can't do anything about, just like they fail in Suez, but Houthis aren't even a state.
So because this trend of relative power continues to weaken, it will continue to be the case going forward, it's only a matter of time that the West really lose all their power and when that time comes Israel will be in very difficult position, because their host are no longer powerful, and all parasites needed a powerful host to survive, less they die.